Combine escarole, dates, and walnuts in large bowl. Cook bacon in medium skillet over medium-high heat until brown and crisp. Using slotted spoon, transfer bacon to paper towels to drain.
Add bacon to bowl with salad.
Discard drippings from skillet; add walnut oil.
Place over low heat.
Add shallot; sauté until soft, about 3 minutes.
Remove skillet from heat; add vinegar and whisk to blend. Season vinaigrette with sea salt and black pepper. Gradually add warm dressing to salad, tossing to coat. Divide among plates.